Enabling rotation over electrophoretic motion in Janus particles under applied electric field

Abstract

Janus particles (JPs) comprising metal and dielectric halves are capable of propulsion perpendicular to an applied electric field, with promising applications in targeted drug delivery and microrobotics. Yet, not all JP geometries behave the same when activated. We explore hemispherical, snowman, and matchstick-like particle dynamics and evaluate threshold values for which electric torque can overcome induced charge electrophoresis. We define conditions where JPs are more likely to undergo rotation in place rather than linear motion, highlighting design features which should be considered when using these particles as materials.